"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MXJ8-R6H : 22 August 2017), Mary Jane Clark in household of James Clark, Addison, DuPage, Illinois, United States; citing enumeration district ED 247, sheet 209A, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0203; FHL microfilm 1,254,203.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9K8-Q36 : accessed 5 January 2019), Mary J Clark in household of Berton Clark, Delaware Township Manchester city, Delaware, Iowa, United States; citing enumeration district (ED) 78, sheet 3B, family 75, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,428.
"Illinois, Civil Marriages, 1833-1889," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q292-T1VV : 16 March 2018), Daniel Clark and Jane Foster, 23 Mar 1852; citing , DuPage, Illinois, United States, Daughters of the American Revolution, Washington D.C. and Hancock County Clerk of Courts, Findlay; FHL microfilm 848,650.
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M85G-GPF : 12 April 2016), Mary J Foster in household of A M Foster, Addison, Du Page, Illinois, United States; citing family 1252, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
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